WO2018195997A1

WO2018195997A1 - Polystyrene foam densification recycling apparatus and method of operation thereof

Info

Publication number: WO2018195997A1
Application number: PCT/CN2017/082602
Authority: WO
Inventors: 陈颂华
Original assignee: 陈颂华
Priority date: 2017-04-28
Filing date: 2017-04-28
Publication date: 2018-11-01
Also published as: CN110461928A; CN110461928B

Abstract

A polystyrene foam densification recycling apparatus and a method of operation thereof, the polystyrene foam densification recycling apparatus comprising a cooling tank (2) and a oil bath (1), the oil bath (1) having stored therein thermal oil (11), a density of the thermal oil (11) being no greater than 0.95 g/cc, the cooling tank (2) having stored therein water used for cooling (21), a top end of the oil bath (1) being provided with a feed opening used to add polystyrene foam pieces (31), and a bottom end of the oil bath (1) being provided with discharge opening (12) which may be opened and closed. When in use, a temperature of the thermal oil (11) in the oil bath (1) is increased to between 150ºC and 180ºC, so as to melt polystyrene foam pieces (31) inserted into the oil bath (1), which is hot melted into liquid polystyrene (32), releasing air from in the polystyrene foam pieces (31).

Description

Title: A polystyrene foam densification recovery device and its working method

[0001] The present invention relates to the field of polystyrene foam recovery technology, and more particularly to a polystyrene foam densification recovery device and a method for its operation.

Background technique

[0002] EPS foam board, also known as polystyrene foam board, EPS board, is a light polymer. It is a foamed plastic which is added with a polystyrene resin and is softened by heating with the same heat to form a rigid closed-cell structure. It is mainly used for building walls, roof insulation, composite board insulation, cold storage, air conditioning. , vehicles, ship insulation, floor heating, decorative carving and other fields. This one-time use of EPS is a great waste of resources. According to a review article, among the waste plastics in the world, EPS accounts for about half of the volume, and the annual discard amount is more than one million tons. Since the EPS foam board is not easy to degrade itself after being discarded, it has caused great pollution to the environment. Therefore, the development of EPS recycling, rejuvenation and regeneration has become the most pressing problem in the current EPS packaging industry. At present, EPS recycling mainly involves crushing and recycling. Hot melt recovery and chemical recovery, however, no matter what kind of recovery method needs to be concentrated to reduce the recovery cost, due to the small density of polystyrene foam board, if the polystyrene foam board is directly transported and transported to the centralized recycling site, The freight required for it has far exceeded its own value. Therefore, there is a need for a polystyrene foam densification recovery device which is simple in structure, easy to implement, and low in cost, and realizes defoaming and volume reduction of polystyrene foam.

technical problem

The technical problem to be solved by the present invention is to provide a polystyrene foam densification recovery device which is simple in structure, easy to implement, and low in cost, and a working method thereof.

Problem solution

Technical solution

[0004] In order to solve the above technical problem, the polystyrene foam densification recovery device provided by the present invention comprises: an oil bath, wherein the oil bath contains a heat transfer oil, and the heat transfer oil has a density of not more than 0.95 g/cm 3 . The top of the oil bath is provided with a feed port for adding a polystyrene foam block, and heat is used in the oil bath by using a crucible. The temperature of the oil is heated to 150. C to 180. Between C, so that the polystyrene foam block placed in the oil bath is heated and melted into liquid polystyrene, and the air in the polystyrene foam block overflows. Since the density of the liquid polystyrene is greater than the density of the heat transfer oil, the liquid is aggregated. Styrene settles to the bottom of the oil bath. After a certain amount of liquid polystyrene accumulates at the bottom of the oil bath, the oil bath stops heating, so that the heat transfer oil cools down and the liquid polystyrene cools down to become solid polystyrene, due to solid polystyrene. The density of ethylene is about 1.04 g/cm3, which is greater than the density of the cooling heat transfer oil. Therefore, the solid polystyrene will be deposited on the bottom of the oil bath, and the solid polystyrene can be taken out to complete the defoaming of the polystyrene foam. Reduce volume.

[0005] Further, the polystyrene foam densification recovery device further includes a cooling tank, wherein the cooling tank contains water for cooling, and the bottom end of the oil bath is provided with a closable discharge port, and the bottom of the oil bath is accumulated. After a certain amount of liquid polystyrene, the oil bath stops heating, and the oil bath is moved to the bottom of the oil bath, the discharge port is lower than the cooling water level in the cooling tank, and the discharge port at the bottom end of the oil bath is made of liquid polystyrene. The cooling water flowing out into the cooling tank is cooled by the cooling water to form solid polystyrene. Since the density of the solid polystyrene is greater than the density of the cooling medium water, the solid polystyrene will be deposited at the bottom of the cooling tank by the oil bath. The small amount of heat transfer oil discharged will float up to the surface of the water because of its density lower than the density of water, and it is easy to get in and out of the recovery.

[0006] Further, the polystyrene foam densification recovery device further includes a lifting device for driving the oil bath to lift and lower, so that the oil bath can be raised and lowered above the cooling tank, and the oil bath is heated. The bath is placed above the cooling tank, and the oil bath stops heating. The lifting device drives the oil bath to descend into the cooling tank, which is easy to operate.

[0007] Further, the polystyrene foam densification recovery device further includes an induced draft fan and an exhaust hood, the exhaust hood is disposed above the oil bath, and the inlet end of the induced draft fan passes through the pipeline and the exhaust The cover is communicated so that the gas discharged from the oil bath is exhausted by the exhaust hood and the air blower.

[0008] Further, the polystyrene foam densification recovery device further includes a cooling tank placement frame, the cooling groove is disposed on the cooling trough mounting frame, and the bottom end of the cooling trough mounting frame is provided with a plurality of universal wheels for facilitating movement Cooling tank.

[0009] Further, the lifting device includes a hoisting motor and a wire rope, and a bottom end of the wire rope is fixedly connected to the oil bath groove, and a top end of the wire rope is fixedly connected with an output shaft of the hoisting motor, so that the roll When the motor rotates, the wire rope is wound up, which can drive the oil bath to lift and lower.

[0010] The working method of the above polystyrene foam densification recovery device comprises the following steps: [0011] A, close the discharge port at the bottom end of the oil bath, add an appropriate amount of heat transfer oil to the oil bath, start the oil bath to heat, so that the temperature of the heat transfer oil is maintained between 150 ° C and 180 ° C; A polystyrene foam block is added inside, and the polystyrene foam block floats on the surface of the heat transfer oil.

[0012] B. Continuously heating the heat-conducting oil so that the polystyrene foam block floating on the surface of the heat-conducting oil is gradually heated and melted into liquid polystyrene and settled to the bottom of the oil bath, and the air in the polystyrene foam block overflows.

, Start the induced draft fan for centralized collection.

[0013] C, the liquid polystyrene at the bottom of the oil bath accumulates to a preset amount 吋, stops heating the oil bath, starts the hoisting motor to drive the oil bath to descend, and when the oil bath is lowered to the bottom end of the discharge port is placed in the cooling water The inner crucible stops falling, the oil bath is hovered, the discharge port of the oil bath is smashed, the liquid polystyrene flows into the cooling water through the discharge port, and is cooled by the cooling water to become solid polystyrene, and is deposited in the cooling. The bottom of the tank; the heat transfer oil flowing out of the liquid polystyrene floats to the surface of the cooling water.

[0014] D, after the liquid polystyrene at the bottom of the oil bath is emptied, close the discharge port at the bottom end of the oil bath; restart the hoisting motor to lift the oil bath out of the cooling tank, start the oil bath again to heat, and then to the oil bath Continue to add polystyrene foam blocks.

[0015] E. Repeating the above steps A to D, the defoaming and volume reduction of the polystyrene foam can be completed.

Advantageous effects of the invention

Beneficial effect

[0016] Technical effects of the invention: (1) The polystyrene foam densification recovery device of the present invention, the polystyrene foam is heated and melted by a heat transfer oil, and the liquid polystyrene is cooled and solidified by cooling water. The liquid polystyrene flows directly into the cooling water from the heat-conducting oil. During the melting and solidification of the polystyrene, the heat-conducting oil and the cooling water block the air, avoiding contact with the air again, and greatly improving the densification efficiency; The density of the heat transfer oil is smaller than the density of the cold water, so that the heat transfer oil flowing out of the liquid polystyrene floats on the surface of the cooling water and is easy to recover; (3) The hoisting motor drives the oil bath to lift and lower, so that the polystyrene is melted, During the curing process, it is completely isolated from the air, which improves the densification efficiency; (4) The oil bath is heated at 150 °C to 180 °C to avoid the loss of heat transfer oil vaporization, save costs and protect the environment; (5) Oil The bath can be raised and lowered to heat the oil bath, and the oil bath is placed above the cooling tank to reduce heat loss and save energy; (6) The polystyrene foam is defoamed and reduced by using heat transfer oil and cooling water. The polystyrene foam is evenly heated, low in cost and easy to implement. Brief description of the drawing

DRAWINGS

[0017] The present invention will be further described in detail below with reference to the accompanying drawings:

1 is a schematic view showing the structure of an oil bath of a polystyrene foam densification recovery apparatus according to Embodiment 1 of the present invention in a heated state;

2 is a schematic view showing the structure of the oil bath of the polystyrene foam densification recovery apparatus according to Embodiment 1 of the present invention in a cooled state;

3 is a schematic structural view showing an oil bath of a polystyrene foam densification recovery apparatus according to Embodiment 2 of the present invention in a heated state; [0020] FIG.

4 is a schematic view showing the structure of the oil bath of the polystyrene foam densification recovery apparatus of the second embodiment of the present invention in a cooled state.

[0022] In the drawing: oil bath 1, heat transfer oil 11, discharge port 12, cooling tank 2, cooling water 21, cooling tank mounting frame 22, universal wheel 23, polystyrene foam block 31, liquid polystyrene 32 , solid polystyrene 33, air 34, induced draft fan 41, exhaust hood 42, column 43, beam 44, winch motor 45, output shaft 46, wire rope 47

Embodiments of the invention

Embodiment 1

[0024] The polystyrene foam densification recovery apparatus of the present embodiment includes a cylindrical oil bath tank 1, as shown in FIGS. 1 to 2, the cylindrical oil bath tank 1 is a non-compulsory circulation type heat transfer system, and an oil bath tank 1 contains heat transfer oil, using electric heating to control the temperature of the heat transfer oil 11; heat transfer oil 11 can be used in accordance with SH-T

0677-1999 Standard L-QB 280 heat transfer oil with a density between 0.91 g/cm3 and 0.93 g/cm3 and an initial slip of no less than 280 °C. The top end of the oil bath 1 is provided as a feed port for the heat transfer oil 11 and the polystyrene foam block 31, and the temperature of the heat transfer oil 11 in the oil bath 1 is heated to 150 by using 吋. C to 180. Between C, the polystyrene foam block 31 placed in the oil bath 1 is heated and melted into liquid polystyrene 32, and the air 34 in the polystyrene foam block 31 overflows because the density of the liquid polystyrene 32 is greater than that of the heat conduction. The density of the oil 11, the liquid polystyrene 32 is settled to the bottom of the oil bath 1, and after a certain amount of liquid polystyrene 32 is accumulated at the bottom of the oil bath 1, the oil bath 1 stops heating, so that the heat transfer oil 11 is cooled and cooled. The liquid polystyrene 32 is then cooled to become solid polystyrene 33. Since the density of the solid polystyrene 33 is about 1.04 g/cc, which is greater than the density of the cooling heat transfer oil 11, the solid polystyrene 33 will be deposited in the oil. At the bottom of the bath 1, the removal of the deposited solid polystyrene 33 completes the defoaming and volume reduction of the polystyrene foam.

[0025] Example 2

As shown in FIG. 3 to FIG. 4, on the basis of Embodiment 1, the polystyrene foam densification recovery apparatus of this embodiment further includes a cylindrical cooling tank 2, and the diameter of the cooling tank 2 is an oil bath. 1 setting of 2 times of diameter; cooling water 2 is provided with cooling water 21 for room temperature, the bottom end of the cooling tank 2 is supported by the cooling trough mounting frame 22, and four universal wheels 23 are arranged at the four corners of the bottom end of the cooling trough mounting frame 22. It is convenient to move the cooling tank placement frame 22 and the cooling tank 2 such that the cooling tank 2 is placed below the oil bath tank 1. The bottom end of the oil bath 1 is provided with a discharge port 12, and the discharge port 12 is provided with a solenoid valve to control its closing.

[0027] The polystyrene foam densification recovery device further includes a lifting device for driving the oil bath 1 for lifting, the lifting device includes a column 43 fixedly connected to the ground, and the top end of the column 43 is fixedly disposed with a beam 44, the beam 4 4 A winding motor 45 is provided. The output shaft 46 of the winding motor 45 is fixedly connected to the two wire ropes 47. The top end of the oil bath 1 is fixedly connected with the bottom end of the wire rope 47 to rotate the winding motor output shaft 46. 47 is retracted, and then the oil bath 1 is driven to ascend and descend. The polystyrene foam densification recovery device further includes an induced draft fan 41 and an exhaust hood 42. The top end of the exhaust hood 42 communicates with the intake port of the induced draft fan 41 via a duct, and the bottom end of the exhaust hood 42 is horn-shaped, and The oil bath 1 is in a heated state, and the bottom end of the exhaust hood 42 is disposed above the oil bath 1 so that the air discharged from the oil bath 1 can be collected by the draft fan 41 and the exhaust hood 42 and transported to the peripherals. The air purification equipment (not shown) is cleaned.

Embodiment 3

[0029] A working method of a polystyrene foam densification recovery device, comprising the following steps:

[0030] A, close the outlet port 12 of the oil bath 1 and add an appropriate amount of L-QB to the oil bath 1

The type 280 heat transfer oil 11 is started to heat the oil bath 1 so that the temperature of the heat transfer oil 11 is maintained between 150 ° C and 180 ° C; the broken polystyrene foam block 31 is added to the oil bath 1 due to polystyrene The density of the ethylene foam block 31 is much smaller than the density of the heat transfer oil 11, and thus the polystyrene foam block 31 floats on the surface of the heat transfer oil 11.

[0031] B. The heat transfer oil 11 is continuously heated, so that the polystyrene foam block 31 floating on the surface of the heat transfer oil 11 is gradually heated and melted into liquid polystyrene 32, and the air 34 in the polystyrene foam block 31 overflows. start up The induced draft fan 41 collects the overflowed air 34 through the exhaust hood 42 and purifies it by an air purifying device (not shown) of the peripheral device to avoid direct discharge of the polluted environment; since the density of the liquid polystyrene 32 is 1.2 The gram/cubic centimeter is much larger than the density of the heat transfer oil 11, so that the liquid polystyrene 32 settles to the bottom of the oil bath 1.

[0032] C, continuously adding polystyrene foam 31 into the oil bath 1, so that the molten liquid polystyrene 32 is continuously settled to the bottom of the oil bath 1; when the liquid polystyrene 32 at the bottom of the oil bath 1 is accumulated to the preset The quantity 吋, the heating of the oil bath 1 is stopped, and the hoisting motor 45 is started to lower the oil bath 1 into the cooling tank 2 and hovering, and the discharge port 12 at the bottom end of the slick bath 1 is placed in the cooling water 21 and oil The top end of the bath 1 is still higher than the liquid level of the cooling water 21, and the cooling water 21 is prevented from entering the oil bath 1. The liquid level of the heat transfer oil 11 in the same oil bath 1 is not lower than the liquid level of the cooling water 21, and cooling is avoided. The water 21 is refluxed into the oil bath 1; the solenoid valve is activated to cause the discharge port 12 of the oil bath 1 to be smashed, and the liquid polystyrene 32 at the bottom of the oil bath 1 flows into the cooling water 2 through the discharge port 12, and is cooled by the cooling water 2. After the solid polystyrene 33 is formed, since the density of the fixed polystyrene 33 is about 1.04 g/cm 3 , which is still greater than the density of the cooling water 21, the solid polystyrene 33 is deposited and cooled during cooling solidification. 2 is a bottom; density polystyrene with liquid 32 flowing out of its density is less than 11 HTF cooling water 21 is thus the surface 11 conducting oil to the cooling water floats 21, can easily be recycled.

[0033] D, the liquid polystyrene 32 at the bottom of the oil bath 1 is emptied, close the discharge port 12 at the bottom end of the oil bath 1; restart the hoisting motor 45 to lift the oil bath 1 out of the cooling tank 2, start the oil bath 1 Heating again to maintain the heat transfer oil in the oil bath 1 between 150 ° C and 180 ° C, and continue to add the polystyrene foam block 31 into the oil bath 1; the same as the solid polystyrene in the cooling tank 2 By collecting 33, a high-density solid polystyrene 33 can be obtained.

[0034] E. Repeating the above steps A to D, the defoaming and volume reduction of the polystyrene foam can be completed.

[0035] It is to be understood that the above-described embodiments are merely illustrative of the invention and are not intended to limit the embodiments of the invention. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations which come within the spirit of the invention are still within the scope of the invention.

Claims

Claim

A polystyrene foam densification recovery device, comprising: an oil bath, wherein the oil bath contains a heat transfer oil, the heat transfer oil has a density of not more than 0.95 g/cm 3 , and the top of the oil bath is disposed For feeding into the inlet of the polystyrene foam block, the temperature of the heat transfer oil in the oil bath is heated to between 150 ° C and 180 ° C by using hydrazine to melt the polystyrene foam block placed in the oil bath. It becomes liquid polystyrene, and the air in the polystyrene foam block overflows; after a certain amount of liquid polystyrene accumulates on the bottom of the oil bath, the oil bath stops heating, so that the heat transfer oil cools down and the liquid polystyrene cools to a solid state. Polystyrene.

The polystyrene foam densification recovery apparatus according to claim 1, further comprising a cooling tank, wherein the cooling tank contains water for cooling, and the bottom end of the oil bath is provided with a closable After the bottom of the oil bath accumulates a certain amount of liquid polystyrene, the oil bath stops heating, and the oil bath is moved to the bottom of the oil bath, the discharge port is lower than the cooling water level in the cooling tank, and the bottom of the oil bath is discharged. The liquid port causes the liquid polystyrene to flow out into the cooling water of the cooling tank, and is cooled by the cooling water to form solid polystyrene.

The polystyrene foam densification recovery apparatus according to claim 2, further comprising a lifting device for driving said oil bath for lifting, so that said oil bath can be raised and lowered above said cooling bath.

The polystyrene foam densification recovery apparatus according to claim 3, further comprising an induced draft fan and an exhaust hood, wherein the exhaust hood is disposed above the oil bath, and the inlet end of the induced draft fan The duct is communicated with the exhaust hood via a pipe.

The polystyrene foam densification recovery device according to claim 4, further comprising a cooling tank placement frame, wherein the cooling groove is disposed on the cooling trough mounting frame, and the bottom end of the cooling trough mounting frame is disposed A universal wheel.

The polystyrene foam densification recovery apparatus according to claim 5, wherein the lifting device comprises a hoisting motor and a wire rope, and a bottom end of the wire rope is fixedly connected to the oil bath groove, and a top end of the wire rope It is fixedly connected to the output shaft of the hoisting motor.

The working method of the polystyrene foam densification recovery device according to claim 6, The feature is that it includes the following steps:

A. Close the discharge port at the bottom of the oil bath, add an appropriate amount of heat transfer oil to the oil bath, start the oil bath to heat, and maintain the temperature of the heat transfer oil between 150 °C and 180 °C. Add the polymer to the oil bath. Styrene foam block, polystyrene foam block floating on the surface of heat transfer oil

B. Continuously heating the heat transfer oil so that the polystyrene foam block floating on the surface of the heat transfer oil is gradually heated and melted into liquid polystyrene and settled to the bottom of the oil bath, and the air in the polystyrene foam block overflows;

C. The liquid polystyrene at the bottom of the oil bath accumulates to a preset amount 吋, stop heating the oil bath, start the hoisting motor to drive the oil bath to descend, and when the oil bath is lowered to the bottom end, the discharge port is placed in the cooling water to stop falling. Hovering the oil bath to the outlet of the oil bath, the liquid polystyrene flows into the cooling water through the discharge port, and is cooled by the cooling water to become solid polystyrene and deposited on the bottom of the cooling tank; The heat transfer oil flowing out of the liquid polystyrene floats to the surface of the cooling water;

D. After the liquid polystyrene at the bottom of the oil bath is drained, close the outlet of the bottom of the oil bath; restart the hoisting motor to lift the oil bath out of the cooling tank, start the oil bath to heat again, and continue to add to the oil bath. Polystyrene foam block;

E. Repeat steps A through D above to complete the defoaming and volume reduction of the polystyrene foam.